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A138448 as a simple table

n a(n)
1 4
2 48
3 1040
4 7840
5 118096
6 321776
7 1609152
8 3136368
9 9869024
10 39654832
11 59166848
12 171048336
13 316673504
14 421424080
15 718614208
16 1477623888
17 2812035344
18 3434691376
19 6030558512
20 8540018592
21 10088948064
22 16205829952
23 21796024432

[4,48,1040,7840,118096,321776,1609152,3136368,
 9869024,39654832,59166848,171048336,316673504,
 421424080,718614208,1477623888,2812035344,
 3434691376,6030558512,8540018592,10088948064,
 16205829952,21796024432]

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Last modified March 29 09:14 EDT 2024. Contains 371268 sequences. (Running on oeis4.)